Band in a Box is a music program that has several features you will find helpful. You can enter chords as "C-F-G" or as "I-ii-V-I" and it wil display them in any of these modes. If you change the key of the song the chords will change appropriately. There is a "Substitutions" command which will suggest varieties of chords that can be used to create the kind of variety you are talking about. Every musician needs this program anyway, so go ahead and buy it.

Douglas Wolfe

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